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(No Model.) S r M. G. IMBAOH.

BRUSH BORING MACHINE. No. 268,798. Patented Dec. 12 1882.

WITNESSES: INVENTOR yfig I ATTORNEY UNITED STATES PATENT OFFICE.

MARTIN G. IMBAGH, OF NEW YORK, N. Y., ASSIGNOR TO RICHARD CHRIS- TIAN FELLOWS, OF SAME PLACE.

BRUSH-BORING MACHINE.

SPECIFICATION forming part of Letters Patent No. 268,798, dated December 12, 1882.

Application filed January 20,1882. (No model.) 1 Q To all whom it may concern: Be it known that I, MARTIN G. IMBAGH, o the city, county, and State of New York, have made an invention of certain new and useful 5 ltnprovemeutsinBrush-BoringMachines; and I do hereby declare that the following, taken in connection with the accompanying drawiugs, is a full, clear, and exact description and specification of the same.

In the higher grades of brushes the knots of bristles are set in directions inclined from each other, and the holes in which the knots are set must of necessity be correspondinglyinclined. Hitherto holes bored or drilled. in brush-stocks 1 in such inclined directions have been drilled mainly by hand, and great skill is requisite to drill them with an approximation to regularity of divergence. The object of the present invention is to enable the inclined or diverging holes made in the brush hacks or stocks to be drilled accurately with rapidity and economy by unskilled labor; and the invention consists of certain combinations of mechanical devices, which are set forth in the claims at the close of this specifieation. A

In order that the said combinations may be fully understood, I haverepresented' in the accompanying drawings and will proceed to deo scribe the machine in whichI have embodied them for practical use, it being understood that the mechanism may be modified, without ceasing to embody the invention, as circumstances or'the views of different constructors 5 render expedient.

In the said drawings, Figure 1 represents an elevation of the prineipalparts of the machine. Fig. 2 represents a section of a part thereof, and Fig. 3 represents a face view of 40 the brush-back pattern-plate.

In the said machine the drill for boring the knot-holes is carried by a revolving mandrel, A, which is supported by boxes or bearings mounted upon the bed B of the machine, and

i y 4 5 is caused to revolve continuously by powerapplied by a belt to the pulley-wheel d of the mandrel A. The mandrel A is fitted to slide longitudinally in its bearings, so that it may be advanced toward the brush-back and withdrawn from it. In front of the end of the mandrel A is the back-holder E, to which the brush-back F to be drilled is secured in any desirable manner. When the brush-back is to be veneered it may be secured to the back, holder by screws passed throughits substance; 5 but when the back is a solid unvencered back I prefer to secure it to the back-holder by means of edge-clamps, which tit the edges of the opposite longersides of the brush-back. and are drawn toward each other by means of right and left handed screws formed upon a shaft extending crosswise through thebackholder. The position in which the brush-back is held opposite the end of the mandrel A determines the position and inclination of the 6 hole to be drilled. According to my present invention, this position of the brush-back is determined by the position given to the backholder E by meansol' aback-pattern, G. This back-pattern may be a brush-back which has already been drilled to receive the knots of bristles; but I prefer to have it made of hardened steel in the form of the brush-backs to be drilled, and with holes corresponding in arrangement and in inclination with those to be made in the said brush-backs.' In order that the brush-back may be presented to the drill at any required angle of inclination to its surface, the back-holder E is constructed to swivel in the support- H, which connectsit with the bed of the machine, the preferred mode of constructing the swivelingconnection between the back-holderandits support being by means of a ball-and-socketjoint, the ball m. of which is formed upon the stock of the back-holder, while the socket is formed in the support H, which, for the purpose of admitting the ball, is constructed of two pieces secured together. The shank a of the back-holder E protrudes toward the mandrel A from one side of this 0 ball-socket; and in order thatthe back-pattern may control the brush-back the said backpattern is secured to an extension, 8, of the back-holder at the opposite side of the ballsocket.

Immediate] y opposite the back-pattern is the index or stop I for holding the back-pattern, and consequently the back-holder, in its position during drilling. This'index consists in the present case of a round rod constructed to I00 7 slide longitudinally in bearings t t, which are secured to the bed of the machine, the axis of said index being in the same line with the axis of the mandrel A. Thepoint of the index is tapered to enter the holes of the back-pattern Gr.

When the brush-backs are to be drilled with the machine the mandrel, with a drill of the proper size, is caused to revolve rapidly, and a back-pattern, G, of the form of the brushbacks to be drilled and containing the same number of holes in the same relative positions, is secured to the back-holder by screws or other means. The index is drawn forward and is entered in one of the holes of the back-pattern, and as soon as the back-holder is thereby fastened in its position the mandrel A is slid 1ongitudinally toward the brush-back, so as to advance the revolving drill into its substance. As soon as the hole is bored or drilled to the requisite depth the mandrel is moved backward to withdraw the drill, the index is disengaged from the back-pattern,which, with the back-holder and brush-back, is swiveled simultaneouslyto place a new hole of the backpattern opposite the index, the index isengaged in the said hole, and the drilling is repeated.-

As the back-pattern and brush-back are held with their backs toward each other and parallel at opposite sides of the swiveling center of the back-holder, the hole is drilled at the same angle of inclination to the brush-back as the axis of the index is to the back-pattern, but at the opposite side of the line of the axes of the mandrel and index. Hence the brushbaek is applied to the back-holder in a position the reverse of that in which the back-pattern is secured to the back-holder. In practice it is convenient to commence drilling a hole of one of the outermost or innermost rows, and to drill each .hole in that row in succession before the next row is commenced. The drillmandrel may be advanced toward the backholder either automatically at intervals sufficient to give the operator time to shift the index and the back-holder while the drill is out 5 of the brush-back, or be connected with a treadle-lever to move it forward, and with a springer weight to withdraw it, so that as soon as the operator hasshifted the back-holder he (or she) may advance the mandrel by the action of the treadle.

I propose also to make the whole machine automatic in its action; but the improvements for that purpose will form the subject of a distinct patent.

The construction of the parts of the machine may be varied. Thus the'extension s of the back-holder, which holds the back -pattern, may be made longer from the swiveling center than the length from the same center to the brush-back, in which case the back-pattern should be made correspondingly larger than the bruslrback and with its holes correspondingly farther apart; or the proportions of the said parts may be reversed. The swiveling connection also may consist of a rotating universal joint instead of a ball and socket. Parts of the invention are applicable to the setting of the knots or tufts of bristles in the brushback automatically, and purpose to use said parts in connection with knot-setting devices for that purpose.

I claim as my invention- 1. The combination, substantially as before set forth, of the swiveling back-holder, the back-pattern, and the index.

2. The combination, substantially as before set forth, of the mandrel, the swiveling backholder, the back-pattern, and the index. In testimony whereof I have hereto set my hand this 18th day of January, A. D. 1882.

MARTIN G. IMBAOH.

Witnesses:

JAMES O. HoYT, EMiLY HOYT. 

